I have read your blog and do not agree with you about one of your conclusions
to non-existence of ns rrs of www.qq.com in the ns-tel1.qq.com server. One
recursor must request ns rr(s) of www.qq.com to the ns[1-4].qq.com server
before requesting to ns-tel[1-2].qq.com. When it receives the ns rrs and glue
rrs of www.qq.com from ns[1-4].qq.com, it may at last ask ns-tel[1-2].qq.com
what your ns rr(s) is(are). If non-existence, the recursor will continue to ask
other disired type of rrs of www.qq.com to the ns-tel[1-2].qq.com, otherwise
will send requests to the informed servers. No other bad things are seen.
liu mingxing
From: Jeff Peng
Date: 2012-03-21 15:30
To: bind-users
Subject: Re: glub or authauthority NS is cached and used at a cache dns server?
You might want to read my this blog；
http://www.nsbeta.info/archives/115
HTH
于 2012-3-21 15:07, Felix New 写道:
>
> when i dumpdb from the cache dns, some domain's ns records are glue
> DNS, and others are authauthority.
>
> The TTL are different. which type is used in Cache DNS?
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